MCU25 0087 - Reference Document - Coastal Hazard Assessment (As Published)

                                                                           17 The Esplanade, Sunshine Beach                                              Report


                      5.3          Comparison to BMT (2018) Assessment
                      BMT (2018) undertook the ‘Noosa Shire Council Coastal Hazards Risk, Vulnerability and Adaptation
                      Assessment’ on behalf of Noosa Shire Council as part of the Coastal Hazard Adaptation Strategy. MT
                      (2018) undertook a reassessment of the erosion prone area for the beach compartments within the
                      Noosa Shire local government area.
                      The variables of the erosion prone area were calculated at historical beach profiles known as ETA
                      lines. BMT (2018) calculated the erosion prone area at each ETA line and averaged the values across
                      multiple lines to calculate the erosion prone area for each beach compartment. For comparison to the
                      assessment herein the BMT (2018) assessment for the Sunshine Beach compartment and ETA 602
                      are most applicable.
                      Table 5-6 compares key parameters used in calculating the components of the erosion prone area
                      adopted by BMT (2018) and this assessment. Table 5-7 compares the components and width of the
                      erosion prone area.
                      The following sections provide a detailed comparison of the parameters adopted for this study and
                      (BMT, 2018) and justification for any differences in the calculated components of the erosion prone
                      area.
                      Table 5-6 Comparison of erosion prone area calculations parameters

                        Parameters                          M&N Assessment                          BMT (2018)                         BMT (2018)

                        Location                            17 The Esplanade                         ETA 596                            ETA 602

                        Storm tide (m AHD)                        1.74                                 2.20                               2.20

                        Wave Height (m)                           6.2                                  6.2                                6.2

                        Dune Height (m AHD)                       15                                   4.9                                4.9

                        Depth of closure (m AHD)                  -12                                 -11.5                              -11.5

                        Active profile Height (m)                 19                                   16.9                               16.9

                        Active beach width (m)                    542                                  525                                595

                        Median sand size D50 (mm)                 0.22                                 0.22                               0.22

                      Table 5-7: Comparison of erosion prone area components and width

                        Site                        Long-term           Short-term      Recession due            Dune     Factor of        Erosion Prone
                                                    Recession           Erosion (m)    to Sea level rise       Slumping   safety (m)          Area (m)
                                                       (m)                                   (m)                  (m)

                                                      NxR          C1          C2             S                   D           F                   2100

                        ETA 596                        10          21           0             26                  19         23                     99

                        ETA 602                        10          52           0             26                  13         35                   136

                        Sunshine Beach (Average)       10          37           0             26                 16          29                   118

                        17 The Esplanade               10          17           0             15                 25          18                     85


                      5.3.1        Beach Profile
                      Beach environments are in dynamic equilibrium with the prevailing coastal processes and sediment
                      supply that results in the beach profile constantly changing in response to changes in conditions.




                                                                                                   252662-MN-RP-CO-0001B | 10 November 2025 | Page 31

Document Set ID: 24631530
Version: 1, Version Date: 24/03/2026